NetworkPkg/NetworkPkg.dec: Update comments for the PCD
NetworkPkg/NetworkPkg.dec: Update comments for the PCD

Update comment section for the PCD PcdIScsiAIPNetworkBootPolicy.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Hegde Nagaraj P <1a8707f9a9e9fa883c77999d89b885ef97d6a2fb@hpe.com>
Reviewed-by: Wu Jiaxin <91f509c31e98a6df13950454fe51aea543223eaa@intel.com>
Reviewed-by: Sriram Subramanian <f612f24f610c520953254974a2afa5c29f07dc84@hpe.com>
Reviewed-by: Zhang Lubo <1ed5a37ea7f59966ee72cee136ab89437ba8fc11@intel.com>
Reviewed-by: Ye Ting <fe1f30c12225d8cd094a72a37b5acbb01ee15159@intel.com>
Reviewed-by: Fu Siyuan <eef549df2036636f79f66102b4e2dc444721df8f@intel.com>

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